Jack Shaft 3/4" OD x 4-7/8" Over all length. Snap Ring Style. Works with 1.375 x 24 Right hand thread freewheels.
Note: This is for the jack shaft ONLY. Any other parts you need must be added to the order.
The 3/4" OD shaft is 4-12/32" to the outside snap ring grove. The 2nd snap ring grove is 5/8" inward. It has a 3/16" x 1-3/4" long keyway.
The two flats are cut to help remove the freewheel. Place the two flats in a bench vise or hold with a 15 mm open end wrench.
Used to get reduction and / or move the drive more towards the LEFT of the driven freewheel.
Support this with 3/4" Bearings or drop out of a bike. You can add a solid sprocket or place a freewheel adaptor or use a Three prong sprocket / adaptor and freewheel.
Be sure and order a 3/4" Ext snap ring (s) and it will act as a safety to hold the sprocket on and retain the key if the set screws come loose on the sprocket. Here is the link. 3/4" External Snap Ring
Made out of 12L14 steel and Zinc Plated.
More jack shafts that you may want to look at below:
